Exam 1 - 8. Projection Geometry

Question 1

2

____ measures how well a boundary betwen two areas of a differing radiodensity is revealed.

Question 2

3

____ measures how well a radiographic is able to reveal small objejcts that are close together.

Question 3

4

Since x-rays are ____ in nature, their projection of an object do not ____ at the _____ on an image receptor. Therefore, there is a zone of ______ known as the _____.

Question 4

5

The focal spot size should be ______

Question 5

6

What is the term for the region on the target which represents the total area of the target where electrons are focused on.?

Question 6

6

What is the term for the area measured under the anode and is a function of the angle of the target?

Question 7

6

When the angle of the target with respect to the central X-ray beam is small, so is the _____. This ____ sharpness.

Question 8

7

Increasing the source-to-object distance reduces the _____ of the x-ray beam.

Question 9

9

Image distortion is when an image appears smaller or larger than the original object. This occurs when not all parts of the object are at the ______.

Question 10

10

When does foreshortening occur?

Question 11

11

When does elongation occur?

Question 12

12

What are the two ways to minimize shape discrepancies with x-rays?

Question 13

15

What are two methods for obtaining the third dimensional view?

Question 14

17

What is the SLOB rule?

Question 15

19

The SLOB rule may be used to locate the ____ or ____ position of the object as well.

Question 16

20

What is the Egg Shell Effect?

Question 17

21

What are the three categories of intraoral radiographs?

Question 18

21

What do periapical projections show?

Question 19

21

What do bitewing projections show?

Question 20

21

What doe occlusal projections show?

Question 21

22

What are the two techniques for intraoral X-ray acquisition?

Question 22

22

Paralleling (long cone) technique requires at least ____ (size of long cone).

Question 23

24

What is the bisecting angle technique?

Question 24

25

What is the preferred technique for periapical radiography?

Question 25

26

Use of bisecting angle technique may be needed in special situations such as _____. But, routine use is not recommended.

Question 26

29

For PAs, the ____ of the crown and root should be visible.

Question 27

29

In PAs, at least ____,, of apical bone should be visible past the apex.

Question 28

40

____ is the movement of an x-ray cone nad beams in an up and down direction.

Question 29

40

With vertical angle, heam hits the tooth and receptor at a ____.

Question 30

44

___ is movement of x-ray cone and beam side to side.

Question 31

44

With the horizontal angle, the beam is directed through the _____ to open contacts.

Question 32

50

What are 5 reasons for taking bitewing radiographs?

Question 33

51

What are the two most cirtical requirements for bitewing radiographs?

Question 34

71

For occlusal radiograhy, a size ___ PSP is used.

Question 35

71

Occlusal radiography shows a ____ than periapical.

Question 36

72

Occlusal radiographs localize objects in ____ like an impacted teeth,

Question 37

72

Occlusal radiographs can be used to evaluate the _____ in the jaw and the ____ of the jaw.

Question 38

72

Occlusal radiographs can detect ____ in the submandibular gland.

Question 39

72

Occlusal radiographs can be used for patients who cannot ____ or for children who are too small for PA radiographs.

Question 40

84

Always ____ to make sure that the sensor is centered in the right position.